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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409e3e6ff9f6ff20c26948a85af8a38037a2985bea3330d183edd45907c64377' 
  AND token = 'hRasitC/fuYSU45BD24ddJQG3sd6wCgYpXOMjQRWGRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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