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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a83fa576f9ebaa467720ae63a528cef210f025083c7d5deeb1cb7fe5bae29c6' 
  AND token = 'yE3buJNCRbRvMAYp4FZ6epb9ZKP4L4KnL078GrqgDaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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