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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5d396ac854964d375024a2b36343d8efaafaddd238f50759b040a63a15432a' 
  AND token = 'WdRsmR3thDG+/IJjla8wK6adR7M+WYQ698ScitO7vtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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