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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd03686fba9c93ed16dafd085f7c4c4747753453e9d81080903a8225b61762c' 
  AND token = 'VHDGkyyr2HOwHAm1TRR2+VINYtrkx7w8un9K5y00G10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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