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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de60c78c5fa809826f736fda3326bece6f950fae272e10fdb6abf4a77cfad7d' 
  AND token = '89o/QeBXlVsduli0RvpLCO+r+VmrxBbl8WntEF3+NhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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