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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcdcf1d18e87c201ed9d003a7200659217379e409ccd7891519f37b9b9934be' 
  AND token = 'lYs+79m9cped/xxF0Uepl69YKoQcMY8v31koOLzTe4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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