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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cace806873ff88119b2364748f411082e1115676975cb85828b7d509e212134' 
  AND token = 'IWC6u2c5gYMxDpU4CEPGKAMow3aUtiuXnntziwdfcKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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