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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dde41ed666f4da91bfc049c379e05231fabcedc31a2c5c2df1eaf49c9443c62' 
  AND token = '/0AngrBCpnSOK0zNrrR8t7wZOA6mjroy+wvUtdXVvoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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