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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58eee09f2a576c99665b795667ea3d1f697b98ec15a805e5e9fa2a2d1ed69354' 
  AND token = 'jRyvKUJnQSVJKB47y1iCrxWCFZiFAjMjMw4EnVoLmZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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