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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074562c9cded088a362bc8d658fbfa5f14999e67bc5d5f3c96905489d00b28f6' 
  AND token = '/ICfNzDqcjD7fygtOB02XFOfZeWpSJY4DzMhZ36mBtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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