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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dfbef9bb13a6d4a6cd0d156290859ba5a742a4264c24e27552649a5e675edb' 
  AND token = 'F5yAgJkHpG0aJrpgCXPJIoNCHp+4MYBEJKWwVhXPDOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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