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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f5ad28479b19042de6bc930e559a43c8744d6d7efb030efde1a58975bfe28c' 
  AND token = '0w0BWWNgZFiMj8rxR+hJITBXeA5O6+ZHjT8H6SBByzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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