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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf6944a9655dcaf025dc76594463c92ec19e0004f7efb8952200edb06a867ef' 
  AND token = 'zWoRdNu6Xf4iNPLny8iNK5NWD61ST08IoDYWivILaDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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