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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e575ebf81ea79958cb68e7bbd88cea2f4bc3b29ddd46de3b10be5a6d5260904b' 
  AND token = 'aXm28Z8difY9zMN941iSFjHzeEi6rGhi/xkNIjkZ2m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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