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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84d8e7cd03cc23505723d5c49611c05533846dcacc89ff23858d8b6a2fcc1d8' 
  AND token = '/H8Jb/a26C8OPuw9JN91qQ0aLX9NUt2BD85xT5Q9UMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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