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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5447baf2e594c2c7bdfcb7422662a5006e470f305347538152ef3f48885bd346' 
  AND token = 'v4KXKAxRDx1k8iV9MHAviYzmoJqCtMNruHc7JQGv8u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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