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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fc2c725903c50dccd4700a5e0f178005b49cc1b125bebc89622feeb7a3671d' 
  AND token = 'Lb4kzHs0yYbwa2cqTmnsFY0yAL8c9desM2G/qOQ80T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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