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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f88b8a7438c33742ddc428065547fd10a86a7c165d87aabe7b486c98e851b22' 
  AND token = 'TxXMCIpr1N4rRX41T66hyrz9wK66Eos3qzHu1MniaHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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