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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736e646915d290c2f39d883a4b1c60c639d50f364daa66ba8e96ad82a6eed42c' 
  AND token = '6W0L0IYYGEgk22ntk1liVZqQSiaxkr59h867GrVC4pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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