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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833860b9b81b7330195fe0877d9a2a561082e605f1f16a700675796fe88ae2ae' 
  AND token = 'ovdO8NfOGW93vZNlQynuIp0Xm1hbli5QBhJsisFlklc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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