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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669b47542f5af53188084f5cf1c2c7808c2c581936ad1cda92a04ff6b9e1ffb6' 
  AND token = 'Xj6sHl8dVbKUzp6RACWlfR4HF640clMckrd3bPvbUic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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