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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344291c2688dd9d8820722c05eedfeb42013a5103e78e4c5a87c30fba788bbab' 
  AND token = '4YaM9q4hFghbKMnERv3ECqr8oZ90onfMUDrEb7Ysye0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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