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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73743ac35911268b902620c7c469af6fa8fffbb6d66caa0598e1b3d70ed7da8' 
  AND token = 'jKRttdUTZt4//cd5x8JNa3eq7xkkFmYxTcvZ0lQRnVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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