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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de512b243d4bf3642cf9f02550262a06ae1a0868cedb3cf9d30ca0ab6a696f57' 
  AND token = '6gzEtPASSyECgA7Sme0+qRlNEe7bDbMlO9Zgsb6l8BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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