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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23dcc30ca06e3a4e6d4aa58057bcd1f15ed4db85acd881666cf7189846812df' 
  AND token = 'lnWP9cK2hYAkfJCX9lUCQ6lf4NGCf2mQfUvv4EGKSII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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