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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce7c71997d46a836a7a91d0e8b46b0c6f00abcd96608864740c0d56da53a03d' 
  AND token = 'zKGdjpxneDOAcK1Zu4MqLkEMxwBFAs3OuOUZAHXu0NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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