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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babad17cb528016849564a194b18e2d04d73435ebf91a97a7aec5afac2646961' 
  AND token = 'VMbuxTyRKa5/C9kn6l6uSy3KYzLGdORoLayiJQfBylM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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