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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd015b12f0b8570f6d6f000e3530e23b0d2aedbbe5696e839629acd223ddddf86' 
  AND token = 'T/uIjKi+YOa7SvHFkwj7CtHO4HsUBzu72t4dph0jBc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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