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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e8d2aea1fc2a23d7dd9b90c1e0cb35a90d32166b004f5a3b9447f5f7ec7eac' 
  AND token = 'dAzh/ywyyxkyw8gm7bJOvZutYnbFBxriN3kQmXjjs14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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