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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5987d2259b521667cec87d099585cdb7e8586cd9e989fa94e014277e6af47ca2' 
  AND token = 'dTk+8dmnJCAjE97z5a0WhftLyQT252fhh/j5LNx36x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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