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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1818e6f0662adf4cb32af7d66ad26d6bcaf68e40331a1769061c8cf08ce257c' 
  AND token = '8eE+eK31HBHSEICgnE5cigSYvQOKC5svs8Ba6yZQFD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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