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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f879d7e8c4c11b8dcb926b120254507a3fd545be7f61caa6004f0f96e89afbce' 
  AND token = 'FKNluDK7pPzIW9CjdUp9a3/1jO8jlwb2ZV6D/PaLO0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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