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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d88c334cfc6b90ef1eea8476ca2eb6e4c72bb8ce084d21360a0166ebe70b28' 
  AND token = 'KmEM/33yC/Rqkwe7EjDz/7L+nitLkyQbsp4Djb3XJq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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