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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a335fdcbf30bcc821a8a351b052cc0f8d3329c610805f2fee4ca9d8835240300' 
  AND token = 'npbrE1FiKOMHnx4xXfemH6XNRYZyYfSmRududqycZpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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