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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c769aed7cd2196e9f5ff0c322b68129a008a755b7e25ba37eee5453e04efbe' 
  AND token = 'klsfiAPuR0SyXlLwGRRIBxDBEBEL34d6qKAvGiIX7jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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