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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7730e0f284c03674777e9e0e1c8d9c6e8d558d72ebae899dd1fb66e6fb9812b9' 
  AND token = '2pGlxb99sOxiQIl/PolqWXZ314K8vreB64T/ju6Ji0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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