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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c430b52261953d210f1bc316655c74f1c662abe4e03332324e0933cf07b9dedb' 
  AND token = 'Oj0x9GomVoXX/c0wRPgGbxs+tfwAPFAJRQ8DRxpHyMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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