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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a72cc554c603ac393e89a01116cdeaafd44efd4783609c68c20d9d2576c476d' 
  AND token = 'MjOWEftw8exA+OtyfoPuo0CpeUjVxvmw44zIX5DNKCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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