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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc94073a9fa6c8bcecb85311c93d73608b2d8d70e99565edb347ad29c5885dd' 
  AND token = 'xHb5soZUm1OKkJ5CXA+e+LLIUxK0EE/EWcibyUNiWns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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