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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec24eedb930f60ef8d989c152b6e45664ced80afe94d8e8a2d2b08bb57066039' 
  AND token = 'pTuGeFv6LjXQ1plkvz/qoQmQW/GCYa/H4batTsXWg/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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