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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd52916f3aecbb6d50bd7af1d0f11d03bd97307cf25f571fa3c3ff5f8793a15' 
  AND token = '/PceNTfpfu3K3O9RFD4PATtwCHAHhxC9thLKwXFNRfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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