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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b3a59ece4cb819a4ac43d583c6f0188a31bf269630bc86818a344d5956515f' 
  AND token = 'oRf+xRCC4V2hU9hyYRijoPTFk/mlRJQA3DXkpleR/3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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