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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a540bf13402b0c0773cfd650d0c6f54b21d4e9e85c05b4807cedddc7a6c70108' 
  AND token = 'A5Hrlb1CYKoJScsk8fghWUDQ62/U1neft8sn43m1yBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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