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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610c3ed3196fc15fbe8e80f3bc6eff3138c7e13c8a5512df84b27947252f2c23' 
  AND token = '8QyQSYFc6Iq6xaRgOddogdypB7Zbo8r7XGLL9hWsXfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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