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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17afa74a4f8da81897e3889ed539039b532f61d487d863fc50ea1caa169bc0c3' 
  AND token = 'f33HoRv1H9LA1Tgw/fzcE2YwGUfholHVsNLYbYkXJvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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