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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15cc8b43ff70c3d7012293b4cd6e35e8d36339c1be5ce6ba5798fd22a7d92a5' 
  AND token = 'OnJyir0+gZvItgoXD3SWuF4nHq5hyLdQ7Uid2H+ncec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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