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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdecb641e8f38160f75a9ad0c72ffffc4ee7fd6faa440e5c7c2063b239b80075' 
  AND token = 'pay1pdnHSWM+VR2/hj2lJWhI20BAFjcjA1e4IwxC/ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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