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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0a47e83d9e43d21831052a698c4c4aae134fe2afb27f31f30a35ade10392d9' 
  AND token = 'qowMSj7wAhVKqy2KsPu5vTFh+36JUeq4peUingpD71E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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