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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1c5078c726f3160e3a3ff5c6eef22a79a24c23baadc16015f4243b191bc35b' 
  AND token = 'qrHBk0CvfjvLaVEjH5GS4wCLuQVws3HTc8BnA8lV1eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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