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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b646a44985535afbb5483bc846eb9091501def7ccc8cf80fd4f4a3315831586' 
  AND token = 'N4KZgw5fiIDt9CONEdmmVDlUb+bATkh6uyL7DVkbvwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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