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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136f8297be5ceb12d47315f5a5b46aeabda7ca760a59cc88cd26195f65730b9d' 
  AND token = 'zheq+dDpqR7YDzDeglJJTNkp6QrSK4KkHNp7GpfS5qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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