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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847a19c600c26a980b49784082b263e7d1274f0caea6c9622e0a8911a5bbab32' 
  AND token = '2/MPWJMILKjE3XfpS4RjgE7VSPQ2m5UQLc3zFgXtcFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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