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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f05be799deace3b66266ffd96f109b3df8a58de4c7214616295babefaa231e' 
  AND token = 'YrPZa1cjKn+tlgkh2oO/6EGqX/SIal7/FtgnzRUT9fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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