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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6bfe0d9c5aaa415ee888f9223c340d7accd8f8ed0cfee5e45dbdf52c07515f' 
  AND token = 'V2Iz7I1ILrxj4me+5+e9MjgyQ3bjlEjOErjYXqnVkac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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