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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb873539fae8b0aeb75b9823e3fe25593af464f53df1f637dc949e8e94ce630e' 
  AND token = 'ARvWxwdLkN+7pFCmdKyX2TTAWdpqnN/q7fwCxHbCT10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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