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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea850b2ba9b9a48f1790edc4d7f95d0808fd71d632b5416f0f198294702a58e' 
  AND token = 's9XWFkFpteFiav5Wjrr4IdvhqMjmFmKWO+ThPleMuX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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