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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85929823199a74634de02165f752b4acda51687de72a388634448ad5845aacb8' 
  AND token = '5Xu4jzfp9kIv8HBcd7Gsw9LZpcYXWQ2aUH/fqtBP9Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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