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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6049636c889e5ac1fbd18c5e5d725a8afe41e60740542c25493563fb7862b756' 
  AND token = 'R6sbeRlPN0oltCxM+H3vIH0jlWZfHytp+cBZeHYSOBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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