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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a83c8c5cea79abda474dced41c171dcc65b5f3f92a5ade1e08abb8bbcce5e6d' 
  AND token = '1E1lTwJdqwQhkW4q8LSL3lsib4DxGrV6iIcaIVoy3ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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