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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04351e0cbaae139f35fd0f188951c026cfffba8ac52cd657a1e3bb81d13245fc' 
  AND token = 'AyOr8u9jQhHlxh2kOEeSmjUTD9LF57fpX1JYEe/DxzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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