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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a60e3a135335b1c5d02b4d6f7bc8c297eed7c1ffbeb250f6631d4ef544f37c6' 
  AND token = 'OnxlZH5svz7rgWDpi1naRvmzvN9MQj2lXU9m07DMHNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}