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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6702599d6483f791fb91d600c437b7ceb8d8e4a7744d587d914da819e0514ca' 
  AND token = 'xf0GjIIlmzbxIdiOu6RZ7A9VkOjjnkeR+9F530k7u3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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